Add: PR Preview

[RaulTrombin]

Sets up a cockpit preview available directly on PR,
works with main deployment branch and automatically clean previews once they are merged/closed.
Details: https://github.com/rossjrw/pr-preview-action

[RaulTrombin]

Looks like we cant't run safely from forks.
rossjrw/pr-preview-action#6

emilk/egui#5131

[rafaellehmkuhl]

Looks like we cant't run safely from forks. rossjrw/pr-preview-action#6

emilk/egui#5131

So it wouldn't work with PR made from forks? Or it just wouldn't work in the fork repositories? The first is a problem, the second is not.

[RaulTrombin]

Looks like we cant't run safely from forks. rossjrw/pr-preview-action#6
emilk/egui#5131

So it wouldn't work with PR made from forks? Or it just wouldn't work in the fork repositories? The first is a problem, the second is not.

Seems we can grant "write" permissions to the action, so any PR made will have preview,
but we need to be sure that in our org, we'll carefully check PR's content and aproove it to run. ( preferably for each org external fork PR, as it can create a bad html, read our org secrets and so on.)

The egui aproach created another organization just to handle previews, so they dont have the issue on their main repo/org permissions.